Finding the Fourth Proportional to 8,112.81, 11,186.34 and 5,991.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,112.81 : 11,186.34 = 5,991.42 : x
2. Step 2: Convert to fraction form
   8,112.81/11,186.34 = 5,991.42/x
3. Step 3: Cross multiply
   8,112.81x = 11,186.34 × 5,991.42
4. Step 4: Simplify right side
   8,112.81x = 67,022,061.20
5. Step 5: Solve for x
   x = 67,022,061.20/8,112.81
6. Step 6: Final answer
   x = 8,261.26